This is a colloquial phrase in Australia to "carry on like a pork chop", maning that someone is behaving in a silly or stupid way.

This expression is a truncated version of the longer and more widespread phrase be like a pork chop in a synagogue; this has been around since the 1950s. Since pork is forbidden food for Jewish people, to describe something as being like a pork chop in a synagogue means that it is highly inappropriate, embarrassingly out of place, and quite unwelcome. The Australian expression carry on like a pork chop has now shifted the focus from inappropriateness to foolishness. (Often happens with truncated expressions — they kind of go their merry way!)

Regardless of the misconceptions that you people use, Porkchop is /not/ a deragatory term for Portuguesr people. In fact, it is often what we Portuguese use to refer ourselves as. Very rarely do actual people from Portugal call themselves Porkchops. Is it used because of the obvious similarities in the words "portuguese" and "porkchop", but also because Portuguese people generally enjoy consuming meat.